Various space agencies are starting to predict re-entry times...
08 May 22:11 UTC (±21 hours) US Space Force
09 May 02:34 UTC (±21 hours) Aerospace
09 May 07:31 UTC (±17:56) European Space Agency
The uncertainties are quite large (21 hours is 13.5 orbits) because a slowly decaying orbit and a spacecraft in an uncontrolled tumble could bounce off the upper atmosphere multiple times (or none at all!) before finally re-entering.
SpaceX had a similar but smaller problem last month
Whether it does turn out to be a smaller problem is yet to play out. My guess is that the single stage to orbit Long March 5B will break up much more readily than those Falcon 9 second stage pressure tanks which stayed intact thanks to the thick layer of insulation needed to get them through ride share missions.
Did China actually succeed in placing the first part of a space station into orbit?
Yes. You can see it on any of the satellite tracking websites.
As I write this it is over the southern Atlantic Ocean, after having passed over Baja California, the Galapagos Islands, the Andes Mountains and the southernmost part of Brazil.
China has gone in the opposite direction to the USA and Russia by starting off with uncrewed orbital labs before moving on to this as their first crewed one. Once completed next year, Tiangong is planned to be a little bigger than Mir was, but still much smaller than the ISS.